The CF\JRun team has completed the development and the Beta program and has released the free upgrade for JRun4. Like all updaters Updater 7 contains all prior updaters.
ColdFusion 8 is fully supported with JRun4 Updater 7.
Many new enhancements, platforms have been added – all the details are in the the release notes.
One really good reason to move to U7 is if you are using clustering with in-memory session replication, major performance improvements have been made in how the cluster memers communicate with each other.
JRun 4 Updater Build Number Reference
JRun 4 Updater 2 (build 61650)
JRun 4 Updater 3 (build 75991)
JRun 4 Updater 4 (build 84683)
JRun 4 Updater 5 (build 92909)
JRun 4 Updater 7 (build 106077)